mirror of
https://github.com/intel/intel-device-plugins-for-kubernetes.git
synced 2025-06-03 03:59:37 +00:00
d90e35a2f9
If k8s label starts or ends with a non alphanumeric char, it is ignored. This new split method cuts labels from the last alphanum characters and adds a control character to the beginning of the next chunk. The entity that uses these labels needs to then remove the control character before concatenating the chunks. Co-authored-by: Ukri Niemimuukko <ukri.niemimuukko@intel.com> Signed-off-by: Tuomas Katila <tuomas.katila@intel.com>
118 lines
3.1 KiB
Go
118 lines
3.1 KiB
Go
// Copyright 2022 Intel Corporation. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package pluginutils
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import (
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"strings"
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"k8s.io/klog/v2"
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)
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// Split returns the given string cut to chunks of size up to maxLength size.
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// maxLength refers to the max length of the strings in the returned slice.
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// If the whole input string fits under maxLength, it is not split.
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// Split("foo_bar", 4) returns []string{"foo_", "bar"}.
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func Split(str string, maxLength uint) []string {
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remainingString := str
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results := []string{}
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for len(remainingString) >= 0 {
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if uint(len(remainingString)) <= maxLength {
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results = append(results, remainingString)
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break
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}
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results = append(results, remainingString[:maxLength])
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remainingString = remainingString[maxLength:]
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}
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return results
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}
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// SplitAtLastAlphaNum returns the given string cut to chunks of size up to maxLength.
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// Difference to the Split above, this cuts the string at the last alpha numeric character
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// (a-z0-9A-Z) and adds concatChars at the beginning of the next string chunk.
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func SplitAtLastAlphaNum(str string, maxLength uint, concatChars string) []string {
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remainingString := str
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results := []string{}
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if maxLength <= uint(len(concatChars)) {
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klog.Errorf("SplitAtLastAlphaNum: maxLength cannot be smaller than concatChars: %d vs %d", maxLength, uint(len(concatChars)))
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results = []string{}
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return results
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}
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isAlphaNum := func(c byte) bool {
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return c >= 'a' && c <= 'z' ||
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c >= 'A' && c <= 'Z' ||
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c >= '0' && c <= '9'
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}
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strPrefix := ""
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for len(remainingString) >= 0 {
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if uint(len(remainingString)) <= maxLength {
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results = append(results, (strPrefix + remainingString))
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break
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}
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alphaNumIndex := int(maxLength) - 1
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for alphaNumIndex >= 0 && !isAlphaNum(remainingString[alphaNumIndex]) {
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alphaNumIndex--
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}
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if alphaNumIndex < 0 {
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klog.Errorf("SplitAtLastAlphaNum: chunk without any alpha numeric characters: %s", remainingString)
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results = []string{}
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return results
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}
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// increase by one to get the actual cut index
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alphaNumIndex++
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results = append(results, strPrefix+remainingString[:alphaNumIndex])
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remainingString = remainingString[alphaNumIndex:]
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if strPrefix == "" {
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maxLength -= uint(len(concatChars))
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strPrefix = concatChars
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}
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}
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return results
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}
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func ConcatAlphaNumSplitChunks(chunks []string, concatChars string) string {
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if len(chunks) == 1 {
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return chunks[0]
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}
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s := chunks[0]
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for _, chunk := range chunks[1:] {
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if !strings.HasPrefix(chunk, concatChars) {
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klog.Warningf("Chunk has invalid prefix: %s (should have %s)", chunk[:len(concatChars)], concatChars)
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}
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s += chunk[len(concatChars):]
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}
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return s
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}
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